the flop raise is okay because you don't hold the nut flush and you may want to get As and Ks out just in case it comes spade, spade. the problem is that 6s. although you've made your hand, it's not the nuts, and there's lots of hands the small blind in an extremely low limit game might raise with including: AsKs or As10s. also you have to be wary of people betting open ended straight flush draws. although it may not always be the right play, i don't know what he had, but if he did have an open ended staight flush his raising didn't allow you to put him on that hand so he was probably gett